I'm still flying with my 13cf - just got back from Hawaii last month. I put it in my checked bagage with the valve stem removed, and I DON'T TELL THE AIRLINE that it's there. TSA specifically allows them now as long as they're not presurized. I can find you their webpage if you're interested.
Jerry
Roger that Jerry. I am aware they are allowed I just dont want to pay the $100 scuba tank fee. My suspicion is that even if TSA inspects my main dive bag and finds the tank (no valve, inside plastic bag) they wont say anything but the conti site is very clear about a flat $100 charge for bottles